Antenna



FIG. 1 is a front elevation view of an antenna;

FIG. 2 is a side elevation view thereof;

FIG. 3 is an opposite side elevation view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a rear elevation view thereof; and,

FIG. 7 is a top perspective view thereof.

The broken lines are for illustration purposes only and form no part of the claimed invention. 

CLAIM The ornamental design for an antenna, as shown and described. 